Bot Control for Better Yields in Pistachios and Walnuts
Botryosphaeria (bot) disease control concerns are amplified when spring precipitation is plentiful. Bot infections should be controlled diligently by pistachio and walnut growers. Even a light sprinkling can facilitate spread of Botryosphaeria panicle and shoot blight in pistachios and Botryosphaeria blight and canker in walnuts.
Themis Michailides, Ph.D., plant pathologist at the University of California Kearney Agricultural Research and Extension Center in Parlier, offers preventive fungal disease recommendations to help plan for a successful growing season.
Fungicide Efficacy in Pistachios
Research conducted by Michailides demonstrates the benefits of a spring and early summer fungicide program with DuPont™ Fontelis® fungicide. “Fontelis® is an excellent option for controlling bot in pistachios,” says Jeff Pacheco, a DuPont Crop Protection technical sales agronomist.
Summer Sprays Reduce Walnut Disease
Michailides notes that control of bot is more difficult in walnuts. “We’re able to significantly reduce disease incidence, however, with foliar applications of fungicides applied in mid-May, mid-June and mid-July.” Pacheco says, “For walnuts, Fontelis® works well in a disease program. When evaluated in Michailides’ 2014 bot research study in walnuts, Fontelis® provided control comparable to various premix fungicides on the market.”
Smart Resistance Management
“Fungicide resistance does not appear to be a problem with Botryosphaeria in pistachios or walnuts, but we still recommend rotating fungicides,” says Michailides.
“In pistachios, it’s important to remember that Alternaria late blight resistance can be a concern in some orchards with certain classes of fungicides,” Pacheco adds. “It’s wise to tank-mix fungicides with different modes of action or use rotation as part of a resistance management program for this particular disease.”
DuPont™ Fontelis® is not available in all states. See your local DuPont sales representative or retailer for details on availability.
Inspire®, Quadris® (Syngenta); Luna® (Bayer); Merivon®, Pristine® (BASF); Quash® (Valent); Tebucon® (Repar).
The information provided on this website is for reference only. Always refer to the product labels for complete details and directions for use.